Acetal (polyoxymethylene - POM)

Acetal (polyoxymethylene - POM) is a semi-crystalline, thermoplastic form. Delrin® (DuPont brand of Acetal), is a homopolymer (Pom H). It comes in both black and white. An important difference between Acetal and the original Delrin resin is that Acetal tends to have central porosity. In the sheet will appear as a white strip in the middle. Both ingredients are FDA or 3A (dairy) compliant.

POM H

Pom H has a melting point of 175°C. POM C has a slightly lower melting point at 162-173°C. Overall, Acetal has a very low coefficient of friction making it a good candidate for the production of lightweight bearings. As stated above, there are two types of Acetal (POM); one is a copolymer and the other is a homopolymer. Although the two types have similar characteristics and are quite similar, there are some significant differences in their properties. Acetal copolymer will perform better than homopolymer in areas such as thermal performance, impact resistance, abrasion resistance, chemical resistance and it also has a lower water absorption rate. Homopolymer acetal has high crystallinity, thus enhancing mechanical strength and creep resistance. Homopolymer Acetal is generally resistant to a wide range of solvents and common chemicals but does not perform well when exposed to oxidizing agents and strong acids. Copolymer Acetal is used more often than homopolymer acetal in faucets, impellers, pump parts; for short periods of time where there is ever moisture. Acetal (POM) has high strength, hardness and maintains hardness down to -40°C.

Delrin AF (PomH TF)

Delrin AF (PomH TF) is a combination of 10-25% PTFE, fluorocarbon fibers uniformly dispersed in Acetal/Delrin resin. The resulting product is one that has the strength, toughness, and dimensional stability of Acetal with the added properties of PTFE, which is one of the world's toughest slippery materials. In fact, PTFE, commonly known as Teflon®, is used as a nonstick material on cookware. When long wear and low friction are present in an application, bearings made from Delrin AF maintain high performance at high speeds with little wear. These non-lubricated bearings also do not slip because the static and dynamic friction coefficients are equal. Adhesion is a spontaneous jerking motion that can occur when two surfaces alternately adhere to and slide past each other with a corresponding change in frictional force. PTFE bearings and friction bearings do not require maintenance like other types of lubricants. No additional lubrication required. Additionally, PTFE has one of the highest continuous service temperatures among plastics.

These materials are used in small plastic gears in watches, nozzle heads, knife handles, pump parts, zippers, bearings, screw supports and ski bindings as well as guitar straps and many more. other diverse applications.